﻿using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Text.RegularExpressions;

namespace LIB
{
    /// <summary>
    ///Filter 的摘要说明
    /// </summary>
    public class Filter
    {
        public Filter()
        {
            //
            //TODO: 在此处添加构造函数逻辑
            //
        }
        public static string txt2Html(string txt)
        {
            return txt.Replace("\n", "<br>").Replace(" ", "&nbsp;");
        }

        public static string inputFilter(string input)
        {
            string s="'/&^%#@!<>=|";
            string oldChar = "";
            for (int i = 0; i < s.Length; i++)
            {
                oldChar = s.Substring(i, 1);
                input = input.Replace(oldChar, "");
            }
            input = input.Replace("\\", "");
            input = input.Replace("\"", "");
            return input;
        }

        ///   <summary>
        ///   去除HTML标记
        ///   </summary>
        ///   <param   name="Htmlstring">包括HTML的源码   </param>
        ///   <returns>已经去除后的文字</returns> 
        public static string NoHTML(string Htmlstring)
        {
            //删除脚本
            Htmlstring = Htmlstring.Replace("\r\n", "");
            Htmlstring = Regex.Replace(Htmlstring, @"<script.*?</script>", "", RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"<style.*?</style>", "", RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"<.*?>", "", RegexOptions.IgnoreCase);
            //删除HTML
            Htmlstring = Regex.Replace(Htmlstring, @"<(.[^>]*)>", "", RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"([\r\n])[\s]+", "", RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"-->", "", RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"<!--.*", "", RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&(quot|#34);", "\"", RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&(amp|#38);", "&", RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&(lt|#60);", "<", RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&(gt|#62);", ">", RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&(nbsp|#160);", "", RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&(iexcl|#161);", "\xa1", RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&(cent|#162);", "\xa2", RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&(pound|#163);", "\xa3", RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&(copy|#169);", "\xa9", RegexOptions.IgnoreCase);
            Htmlstring = Regex.Replace(Htmlstring, @"&#(\d+);", "", RegexOptions.IgnoreCase);
            Htmlstring = Htmlstring.Replace("<", "");
            Htmlstring = Htmlstring.Replace(">", "");
            Htmlstring = Htmlstring.Replace("\r\n", "");
            Htmlstring = HttpContext.Current.Server.HtmlEncode(Htmlstring).Trim();
            return Htmlstring;
        }

        /// <summary>
        /// 提取HTML代码中文字的C#函数
        /// </summary>
        public static string StripHTML(string strHtml)
        {
            string[] aryReg ={
           @"<script[^>]*?>.*?</script>",
           @"<(\/\s*)?!?((\w+:)?\w+)(\w+(\s*=?\s*(([""'])(\\[""'tbnr]|[^\7])*?\7|\w+)|.{0})|\s)*?(\/\s*)?>",
           @"([\r\n])[\s]+",
           @"&(quot|#34);",
           @"&(amp|#38);",
           @"&(lt|#60);",
           @"&(gt|#62);",
           @"&(nbsp|#160);",
           @"&(iexcl|#161);",
           @"&(cent|#162);",
           @"&(pound|#163);",
           @"&(copy|#169);",
           @"&#(\d+);",
           @"-->",
           @"<!--.*\n"
          };
            string[] aryRep =   {
             "",
             "",
             "",
             "\"",
             "&",
             "<",
             ">",
             "   ",
             "\xa1",//chr(161), 
             "\xa2",//chr(162), 
             "\xa3",//chr(163), 
             "\xa9",//chr(169), 
             "",
             "\r\n",
             ""
            };
            string newReg = aryReg[0];
            string strOutput = strHtml;
            for (int i = 0; i < aryReg.Length; i++)
            {
                Regex regex = new Regex(aryReg[i], RegexOptions.IgnoreCase);
                strOutput = regex.Replace(strOutput, aryRep[i]);
            }
            strOutput.Replace("<", "");
            strOutput.Replace(">", "");
            strOutput.Replace("\r\n", "");
            return strOutput;
        }


        #region   取出文本中的图片地址
        /**/
        ///   <summary>
        ///   取出文本中的图片地址
        ///   </summary>
        ///   <param   name="HTMLStr">HTMLStr</param> 
        public static string GetImgUrl(string HTMLStr)
        {
            string str = string.Empty;
            string sPattern = @"^<img\s+[^>]*>";
            Regex r = new Regex(@"<img\s+[^>]*\s*src\s*=\s*([']?)(?<url>\S+)'?[^>]*>",
             RegexOptions.Compiled);
            Match m = r.Match(HTMLStr.ToLower());
            if (m.Success)
                str = m.Result("${url}");
            return str;
        }
        #endregion

    }
}